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Marketing agencies are being squeezed from both directions — and most haven’t found a way out of the middle. Clients are using AI to question retainers, shrink scopes, and bring execution in-house. Agencies are using the same tools to cut their own costs, only to watch their differentiation evaporate the moment clients understand what changed. The result: only 14% of agencies describe their sales pipeline as “very healthy” in 2026, and 60% of US senior marketing leaders are spending less on agencies as a direct result of AI. This isn’t a cycle. It’s a structural reset. This guide breaks down what AI has already killed in the agency model, the margin trap catching most firms trying to adapt, the three agency types emerging from the squeeze, and the five capabilities that still command genuine pricing power — including the new metric every B2B marketer needs to know.